xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bcache: add mutex lock for bch_is_open

Browse Source 
Since bch_is_open will iterate linked list bch_cache_sets and
uncached_devices, it needs bch_register_lock.

Signed-off-by: Jianjian Huo <samuel.huo@gmail.com>
This commit is contained in:
Jianjian Huo
2014-07-13 09:08:59 -07:00
committed by Kent Overstreet
parent 5b25abade2
commit 789d21dbd9
1 changed files with 2 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/bcache/super.c
View File

@@ -1966,10 +1966,12 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (IS_ERR(bdev)) { if (IS_ERR(bdev)) {
if (bdev == ERR_PTR(-EBUSY)) { if (bdev == ERR_PTR(-EBUSY)) {
bdev = lookup_bdev(strim(path)); bdev = lookup_bdev(strim(path));
mutex_lock(&bch_register_lock);
if (!IS_ERR(bdev) && bch_is_open(bdev)) if (!IS_ERR(bdev) && bch_is_open(bdev))
err = "device already registered"; err = "device already registered";
else else
err = "device busy"; err = "device busy";
mutex_unlock(&bch_register_lock);
} }
goto err; goto err;
} }